You have a problem if you have nobody to trust like a neighbor for example, with your mail for that long of a period. What comes to mind is a good size PO box to forward your mail to. Of coarse you also need to be on top of bill payment via the internet for your credit card dues and such, along with automatic payments for utilities and scheduled services.
We lived in a fairly rural area where everyone knew their mail carrier and post office staff by first name. Our carrier told us to do what Barry-Sue mentioned. We were hesitant at first but no problems occurred. Our carriers sorted their own mail and disposed of the weekly circulars with our permission. That did cut down on the amount they had to hold.I certainly understand larger city post offices might have to adhere to the 30 day limit but may have an alternative suggestion.Gail